Results of the SPS Beam Test @ CERNC. Irmler (HEPHY Vienna)

Micron Sensor

Beam Test Setup

Results

04/07/2008 C. Irmler 2

Type: DDD5used for D0 @

Fermilab

Size: 120 mm x 21 mm300 µm thickVdepl = max. 50 V Rpoly = 2.5 MΩ

p-side: 384 strips 50 µm pitchw/o intermediate

strip

n-side: 768 strips153.5 µm pitch

double metal layer 384 readout strips40.5 µm readout

pitch

Results of the SPS Beam Test @ CERN

Micron Sensor - Overview

n-side

p-side

small poly silicon resistors

04/07/2008 C. Irmler 3

Results of the SPS Beam Test @ CERN

Micron Sensor – CV CurveCV Curve - Micron DDD5

Vdepl = 24 V

0.0E+00

2.0E+17

4.0E+17

6.0E+17

8.0E+17

1.0E+18

1.2E+18

1.4E+18

1.6E+18

1.8E+18

2.0E+18

0 20 40 60 80 100V [V]

1/C

² [F

- ²]

Vdepl = 24 V (step before depletion, linear fit does not work)

04/07/2008 C. Irmler 4

Results of the SPS Beam Test @ CERN

Micron Sensor – IV Curve

IV Curve - Micron DDD5

0.0

1.0

2.0

3.0

4.0

5.0

6.0

0 20 40 60 80 100

V [V]

I [µ

A]

I [µA]

High Ibias

1.38 µA @ Vdepl

Slope increases above 60 V

04/07/2008 C. Irmler 5

Micron DDD5

Each side read out by three APV25 chips(384 channels)

Flex hybrids with integrated pitch adaptor

On n-side the hybrid is glued onto the sensor.

Results of the SPS Beam Test @ CERN

Micron Sensor Module

04/07/2008 C. Irmler 6

Beam setup: 120 GeV/c π+ / p / K+

(55.67% / 38.95% / 5.38%)

Readout: SVD3 readout system

see previous talk by M. Friedl

Installed Modules: JP module (2007)

2 x SVD3 DSSD (partially ganged) Micron module (new) UV module

UV striplet sensor (2005) Flex module (2006)

SVD3 DSSD (chip on sensor) EUDET telescope

Results of the SPS Beam Test @ CERN

Beam Test Setup

beam

Beam test was performed @ CERN together with the SiLC beam test of our semiconducter group see yesterday´s talk by T. Bergauer.

04/07/2008 C. Irmler 7

Results of the SPS Beam Test @ CERN

Analysis Chain

Pedestal subtraction Common mode correction 2D-clustering (space and time) Calculate cluster signal for each sample

Perform hit time reconstruction see previous talk by M. Friedl

Obtain timing, signal and noise

04/07/2008 C. Irmler 8

Upgrade Studies for the Belle Silicon Vertex Detector

Hit Time Reconstruction

0 50 100 150 200 250 300

0

5000

10000

15000

20000

25000

30000

S peak

tpeakMethod: Multiple samples arround the peak are recorded (6 samples at this beam test) . Cluster signal for each sample is calculated. Fit function is applied to each waveform to optain amplitude and timing. Reference waveform is taken from internal calibration of the APV25 chip. Already explained by M. Friedl

04/07/2008 C. Irmler 9

Results of the SPS Beam Test @ CERN

Beam Test Results (Preliminary)Micron JP single JP ganged UV Flex

p-side

n-side

p-side n-side p-side n-side p-side n-side p-side n-side

Average cluster width

1.67 1.13 2.31 1.92 2.10 1.76 2.21 1.88 2.28 1.91

Cluster SNR 12.6 15.1 12.7 13.9 8.5 10.5 23.6 24.0 13.8 18.4

Single SNR 16.3 16.0 19.3 19.2 12.3 13.9 35.1 32.8 20.9 25.4

Time resolution [ns]

3.89 3.04 3.49 2.74 5.24 4.30 2.55 1.16 3.50 1.90Definitions:

Cluster SNR := Cluster Signal / ( Strip Noise * sqrt (Cluster width) ) Single SNR := Cluster Signal / Strip Noise

Results: SNR of the Micron module is good and within the range of the other modules. Micron has lower cluster width (no intermediate strips). Effect of the 2nd metal layer on n-side is less than that of the long strips on p-side.

Poor SNR for JP module with ganged sensors chip on sensor (M. Friedl).

04/07/2008 C. Irmler 10

Results of the SPS Beam Test @ CERN

Micron Module - Signal Distribution

signal [e]0 10000 20000 30000 40000 50000 60000 70000 80000 90000

en

trie

s [

]

0

2000

4000

6000

8000

10000

12000

Micron_p_side (Micron) - Signal siC8Entr ies 118903Mean 2.07e+04RMS 1.068e+04

/ ndf c 809.7 / 5 7Width 10.3± 1350 MP 13± 1.547e+04 Area 349989± 1.183e+08

GSigma 19.7± 2175

Peak = 16345.7FWHM = 50.0%

Micron_p_side (Micron) - Signal

SNR [ ]0 10 20 30 40 50 60

en

trie

s [

]

0

2000

4000

6000

8000

10000

Micron_p_side (Micron) - SNR snr8Entries 118903Mean 17.47RMS 6.288

clw = 1 2 3+

Peak = 16.67FWHM = 50.5%

Micron_p_side (Micron) - SNR

signal [e]0 10000 20000 30000 40000 50000 60000 70000 80000 90000

en

trie

s [

]

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

Micron_n_side (Micron) - Signal siC32Entries 103393Mean 2.363e+04RMS 1.038e+04

/ ndf c 807 / 62

Width 12.4± 1415

MP 17± 1.838e+04 Area 328392± 1.041e+08 GSigma 23.5± 2796

Peak = 19504.1FWHM = 49.4%

Micron_n_side (Micron) - Signal

SNR []0 10 20 30 40 50 60

en

trie

s [

]

0

2000

4000

6000

8000

10000

Micron_n_side (Micron) - SNR snr32Entries 103393Mean 18.72RMS 7.664

clw = 1 2 3+

Peak = 16.29FWHM = 50.8%

Micron_n_side (Micron) - SNR

Signal has pretty Landau distribution; SNR depends on cluster width

04/07/2008 C. Irmler 11

Results of the SPS Beam Test @ CERN

Micron Module - Noise

strip []0 50 100 150 200 250 300 350

sigm

a [e

]

0

500

1000

1500

2000

2500

Micron_p_side (Micron) - Noise noC8Entries 384Mean 183RMS 112.1

Micron_p_side (Micron) - Noise

sigma [e]0 500 1000 1500 2000

ent

ries

[]

0

20

40

60

80

100

120

Micron_p_side (Micron) - Noise ndC8Entries 384Mean 1089RMS 201.9

/ ndf 2c 29.15 / 7Constant 8.5± 124.2 Mean 6.1± 1042 Sigma 4.4± 105.4

Noise = 1042.3

Micron_p_side (Micron) - Noise

strip []0 50 100 150 200 250 300 350

sigm

a [e

]

0

500

1000

1500

2000

2500

3000

Micron_n_side (Micron) - Noise noC32Entries 384Mean 164.1RMS 112

Micron_n_side (Micron) - Noise

sigma [e]0 500 1000 1500 2000 2500

ent

ries

[]

0

20

40

60

80

100

Micron_n_side (Micron) - Noise ndC32Entries 384Mean 1216RMS 204.3

/ ndf 2c 13.64 / 6Constant 7.8± 114.9 Mean 6.9± 1218 Sigma 5.0± 117.4

Noise = 1217.6

Micron_n_side (Micron) - Noise

Few noisy strips on both sides of the sensor.

04/07/2008 C. Irmler 12

Results of the SPS Beam Test @ CERN

Micron Module – Time Resolution (Preliminary)

p-side: 3.89 ns n-side: 3.04 ns

strongly depends on SNR

h_tdc_cal_diff_1_2_pyEntries 103393

Mean 0.1214

RMS 4.672

Underflow 722

Overflow 0

/ ndf 2c 1975 / 246

Constant 9.6± 2294

Mean 1.11e-02± 3.49e-09

Sigma 0.010± 3.488

tpeak_cal-tpeak_TDC [ns]-20 -10 0 10 20

0

500

1000

1500

2000

2500

h_tdc_cal_diff_1_2_pyEntries 103393

Mean 0.1214

RMS 4.672

Underflow 722

Overflow 0

/ ndf 2c 1975 / 246

Constant 9.6± 2294

Mean 1.11e-02± 3.49e-09

Sigma 0.010± 3.488

(cal. fit (spline) - TDC) vs. TDC

TDC error ~ 1.71 ns

Peak time precision vs. SNR

0

1

2

3

4

5

6

0 5 10 15 20 25 30

Cluster SNR

Trm

s[n

s]

Hamamatsu

Micron

04/07/2008 C. Irmler 13

Results of the SPS Beam Test @ CERN

Micron Module – Time Resolution vs. SNR

n-side

SNR10 20 30 40 50 60

RM

S r

es

idu

al [

ns]

0

1

2

3

4

5

6

7

8

9

10

Cal fit (spline) RMS residuals vs. SNR

04/07/2008 C. Irmler 14

Results of the SPS Beam Test @ CERN

Summary

Testbeam performed to evaluate Micron DDD5 sensor.

Minor deviations of CV and IV curve observed. Ibias above 1 µA

Few noisy strips detected.

SNR within the expected range. Time resolution corresponds to SNR. Noise contribution of the second metal layer is less than expected.

04/07/2008 C. Irmler 15

Results of the SPS Beam Test @ CERN

Thank you for your attention

04/07/2008 C. Irmler 16

Results of the SPS Beam Test @ CERN

BACKUP SLIDES

04/07/2008 C. Irmler 17

Results of the SPS Beam Test @ CERN

2D-Clustering

Search for neighbouring strips above threshold and mark them in a hit map.

Search continuous areas (clumps) and calculate outline.

2 Steps:

04/07/2008 C. Irmler 18

Results of the SPS Beam Test @ CERN

Occupancy-Reduktion – Principle

Schwellw ert

Schwellw ert

Schwellw ert

Schwellw ert

Zeit

Zeit

Zeit

Zeit

04/07/2008 C. Irmler 19

Results of the SPS Beam Test @ CERN

Multipeak Mode

Particle signal

04/07/2008 C. Irmler 20

Results of the SPS Beam Test @ CERN

Occupancy-Reduktion – Hit Time Reconstruction

Threshold

Threshold

Tim e over threshold ~ 2000ns (m easured)

Tim e over threshold ~ 160ns (measured)

Sensitive tim e window ~ 20ns

VA1TATp~800ns

APV25Tp~50ns

Pulse shapeprocessingRM S(tm ax)~3ns

Gain ~12.5

Gain ~8

Total gain ~100

04/07/2008 C. Irmler 21

Results of the SPS Beam Test @ CERN

APV25

preamp shaperAPSP

S/H

inverter

pipeline

MUX gain

128:1MUX

Differentialcurrent

output amp